N°5 Carbon is the basis of many compounds, including sugars. During aerobic
decomposition of 1 mole of glucose, 2883 kJ of free energy is released, with
anaerobic process - 208 kJ. How much energy is released during the decomposition
of 15 g of glucose a) aerobically, b) anaerobically?
N°6 Some soluble carbonates hydrolyze irreversibly. Write three reactions
irreversible hydrolysis of metal carbonates.
N°7 50 g of calcium carbide and 2 L of nitrogen (STP) reacted. Determine the mass
of the resulting potassium cyanide.
CaC2 + N2 = CaCN2 + C (1100°C)
CaCN2 + C + K2CO3 = 2KCN + CaCO3
Is it possible to dissolve such an amount of potassium cyanide in 10 ml of water at
a) 25°C, b) 100°C? (mass fraction of potassium cyanide in a saturated solution at
25°C - 41,7%, at 100°C - 55%).
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